having issues with extracting "self-extracting" exe file on Mac using this free utility.

I'm trying to extract a exchange 2007 service pack, as i don't Windows installed in VM (as yet), so I thought i could just use this. As I'm aware, it only extracts some exe files, but self extracting files shouldn't be a problem..

Not even half way through, Unarchiver quits. with an error saying unable to extract *.dll file ??

Windows won't have this issue,, maybe a possible buggy utility ? Anything else i could try without Windows ?

That happens sometimes with self-extracting EXEs, which come in all kinds of flavors, not all of which The Unarchiver understands. If I were you I'd report this as a bug to the developer of The Unarchiver.